Specifically, the gold purity in Kangxi period is marked as follows:
Marking symbol: Gold products will be engraved with specific symbols to indicate their purity level. One of the most common symbols is the word "Bao", that is, draw a dot in the middle of the word "Bao" or indicate it with a vertical line. This symbol is engraved in the appropriate position of gold products to show the purity grade.
Text marking: On gold products, words indicating purity grade are usually engraved. Commonly used words are labeled "pure gold", "pure gold" and "gold content" to explain the purity information of gold products.
It should be noted that the gold standard in Kangxi period may be different from modern standards, so the specific purity value may not directly correspond to modern international standards, such as purity of several thousandths. This is because there may be differences in gold purity standards in different periods and regions.
If more specific information is needed, it is suggested to consult relevant historical documents or consult professional historians.